MAVERICKS & MAIL

Hi,

A month ago, I installed Mavericks in my MAC. Since then, I have been encountering problems with sending e-mails (gmails, cloud) from my MAIL. I ckecked configuration of the accounts (2 gmails + 1 icloud) and they look fine. I can send e-mail using google chrome, but not MAIL. Any suggestions on how to get around this problem. Thanks